MOBILE, Ala. -- A fire at a house on Riviera Drive started in an upstairs bedroom and spread, causing heavy damage to the second floor, Mobile Fire- Rescue Department officials said Monday in a news release.

Fire investigators said the owner — who was not named in the release — told officials the house is not his primary residence, although he stayed in the house Sunday night.

The blaze appears to have originated in an upstairs bedroom, spreading and causing heavy damage to the second floor area, fire officials said. The first floor area suffered water damage, officials said.